MentorMob
Review and Ratings:

Concept/Innovative : 0.7 - This app help users in self learning things like Kiteboarding, Entrepreneurship, Photography, Parenting, Snowboarding, Bachata, Wedding planning and Salsa.
Usability: 0.8 - Not difficult to understand the functionality
Functionality/Correctness : 0.7 - Major issues not found but it crashed several times on iPad mini
User Interface : 0.9 - User interface is excellent !
Performance : 0.7 - User need to depend on internet connection to use this app. Adding some offline functionalities can improve the customer engagement.